Concrete for rehabilitating historic building

Abstract

The invention provides concrete for rehabilitating a historic building. The concrete comprises the following materials of cement, pebble, sand, water, mineral powder, fly ash, silica fume, metakaolin, sodium sulfate, a polycarboxylic water reducer, a cement expansive material, grace fibers, carbon fibers, glutinous rice mortar, a pumping aid, epoxy resin and a curing agent which are mixed according to a certain mass ratio. The formed concrete is short in time of coagulation, high in strength after coagulation, high in impermeability grade, high in slump characteristic as well as high in workability and plasticity effect, can prevent the problem that the concrete in a super-long concrete structure is easily cracked, and meets the requirements on toughness and seepage-proofing performance of the concrete in rehabilitation of the historic building; and the industrial residue and other materials are utilized, so that the concrete is a green and environmentally-friendly concrete.

Description

Technical field [0001] The invention relates to a kind of concrete, in particular to a concrete used for the restoration of ancient buildings. Background technique [0002] Concrete refers to a mixture composed of cement, granular aggregates, necessary chemical admixtures and mineral admixtures, or a composite material with a pile structure after being hardened. Concrete is one of the most important civil engineering materials in modern times. Concrete has the characteristics of abundant raw materials, low price, and simple production technology, so its consumption is increasing. At the same time, concrete also has the characteristics of high compressive strength, good durability, and wide range of strength grades. [0003] In ancient civil engineering in China, glutinous rice mortar for ancient buildings in our country was the most widely used building bonding material in ancient China. The glutinous rice mortar has good mechanical properties such as high degree of toughness, goo...

AI Technical Summary

Problems solved by technology

[0003] In ancient civil engineering in my country, glutinous rice mortar for ancient buildings in my country was the most widely used building bonding material in ancient my country. Glutinous rice mortar has good mechanical properties such as high strength, good toughness, and superior seepage resistance. Due to the corrosion of buildings, more and more ancient buildings need to be repaired, but ordinary concrete cannot be used in the field of repairing ancient buildings. It is easy to have honeycomb defects on the concrete surface without cement mortar, resulting in cracks, causing secondary damage to ancient buildings, and also It is not conducive to the beauty of ancient buildings; if the ancient buildings are directly repaired with glutinous rice mortar, the resulting building will have the characteristics of insufficient compressive strength, poor anti-shrinkage performance, and long setting time. The setting time of using traditional glutinous rice mortar is 5 days. The 30-day strength is 19.3-24.2MPa, and the impermeability level is about S6